| 摘要 |
A method of making an investment casting mould comprises producing a CAD definition of a turbine blade (100), and determining the distribution of isosurfaces of constant temperature (112) around the CAD definition of the at least one article (100) if the external surface (108) of the CAD definition of the at least one article (100) was at a high temperature (Thigh). One of the isosurfaces of constant temperature (112) is selected to define the external shape and the thickness of an investment casting mould (114). A pattern (10,12) of the turbine blade is produced from the CAD definition of the turbine blade (100). The investment casting mould (70) is made with an internal shape defined by the pattern (10,12) of the turbine blade and an external shape and thickness distribution defined by the selected isosurface of constant temperature (112). The pattern (10,12) is then removed from the investment casting mould (70). <IMAGE> |
